TaskCollection Class

public sealed class TaskCollection : IEnumerable, 
	IDisposable

public class Program
             {
                bool RootFolderHasTask(string taskName)
                {
                   if (TaskService.Instance.RootFolder.Tasks.Count > 0)
                   {
                      return TaskService.Instance.RootFolder.Tasks.Exists(taskName);
                   }
                   return false;
                }

                TaskCollection GetRootTasksStartingWith(string value)
                {
                   var pattern = $"^{Regex.Escape(value)}.*$";
                   return TaskService.Instance.RootFolder.GetTasks(new Regex(pattern));
                }

                public static void Main()
                {
                   foreach (var task in GetRootTasksStartingWith("MyCo"))
                      if (RootFolderHasTask(task.Name))
                         Console.WriteLine(task.Name);
                }
             }